# HiCal vs One Calendar

The clearest difference is in-app purchases: HiCal at none against One Calendar's 1. HiCal also leads on iOS requirement (13.0 vs 15.0). One Calendar's advantage is review sentiment (81% vs 55%) and ratings volume (21K vs 25). On price, rating, ads and device support there is nothing between them.

Both are free to download. One Calendar sells 1 one-off in-app purchase. HiCal asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.8 for HiCal against 4.8 for One Calendar. That said, the two scores are not equally well evidenced: One Calendar has 21K ratings behind it against 25, so its average is the more settled of the two. Written reviews are what separate them: 55% of HiCal's written reviews are positive against 81% of One Calendar's.

HiCal ships an update every 2 months, One Calendar fortnightly. The most recent releases landed on October 21, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | HiCal | One Calendar |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (25 ratings)](https://appshunter.io/ios/app/hical-collaborative-calendar/id913908607/reviews)** | [4.8 (21K ratings)](https://appshunter.io/ios/app/one-calendar/id1238379385/reviews) |
| Number of ratings | 25 | **21K** |
| Positive reviews | 55.0% of reviews | **80.7% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Fortnightly** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 3 MB | 89 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 12+ |
| Developer | [Nakagawa Yugo](https://appshunter.io/developer/1229738088) | [Code Spark](https://appshunter.io/developer/1238379384) |

## What reviewers say

### HiCal

[App page](https://appshunter.io/ios/app/hical-collaborative-calendar/id913908607)

This app facilitates collaborative event planning and scheduling for groups. Share timetables, receive real-time updates on changes, and communicate via comments. Ideal for students, project teams, and organizations to stay synchronized.

**Highlights:** Group event scheduling, Real-time push notifications, Event comments and discussion, Shared timetables, Private and public groups, Event repetition support

**In-app purchases:** none


### One Calendar

[App page](https://appshunter.io/ios/app/one-calendar/id1238379385)

Consolidate all your digital calendars into a single, easy-to-read view. Manage appointments, events, and birthdays from various providers like Google, Outlook, iCloud, and more, all within one application.

**Highlights:** Integrates multiple calendar providers, Easy-to-read overview, Manage appointments and events, View birthdays, Cross-platform availability

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| OneCalendar premium | $5.99 | one-time |

**What reviewers like**

- 🚀 Easy to use
- 👍 Clean and simple interface
- 👍 Integrates multiple calendars
- 🚀 Syncs across devices
- 👍 Customizable colors and themes

**What reviewers complain about**

- 🐛 Syncing issues
- 🐛 Bugs and glitches
- 🔒 Lacks security features
- 🔋 Drains battery
- 👎 Restrictive features in free version

**Reported bugs**

- Sync errors
- Unresponsive buttons
- Incorrect time zone display
- Duplicate events
- Inability to delete future occurrences of recurring events

**Requested features**

- Multiple reminders for events
- Ability to edit recurring events
- Option to change event calendar after creation
- Printing support
- More customization options


## Frequently asked questions

### Is HiCal free?

HiCal is free to download, with no in-app purchases.

### Is One Calendar free?

One Calendar is free to download, with in-app purchases available.

### Which has better reviews, HiCal or One Calendar?

HiCal is rated higher. HiCal averages 4.8 out of 5 from 25 ratings, while One Calendar averages 4.8 from 21K ratings.

### Do HiCal or One Calendar have ads?

Neither HiCal nor One Calendar shows ads.

### Which is updated more often, HiCal or One Calendar?

HiCal ships an update every 2 months, and One Calendar fortnightly. Most recently, HiCal was updated on October 21, 2026 and One Calendar on October 30, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*